Teresa is the Spanish form of Theresa — of disputed origin, possibly from the Greek therizein (to harvest) or from the small Greek island of Therasia near Santorini. Saint Teresa of Ávila (1515-1582), the Spanish Carmelite mystic and reformer, gave the name worldwide Catholic resonance. Mother Teresa of Calcutta (1910-1997) brought the name modern global humanitarian fame.
Teresa has been continuously in the U.S. top 500 for over a century. Today it sits in the U.S. top 700 — quietly used, with the deepest possible Catholic association.
Teresa reduces to one — the number of devoted singular focus.